Toothbrush holder



FIG. 1 is a perspective view of a toothbrush holder showing my new design;

FIG. 2 is a front view thereof; the rear view being identical;

FIG. 3 is a left side view thereof, the right side view being identical; and,

FIG. 4 is a top view thereof.

The bottom view forms no part of the claimed design. 

The ornamental design for a toothbrush holder, as shown and described. 